I read a ton on here about this. It seems to get an US 40 to balance even close you need to get rid of the lead ingot engine mount. At least that's the general consensus. I bought a nice light Hayes "glass filled?" engine mount that is over 2oz lighter than the standard one. But the holes don't line up, and the mount is smaller, but just enough to get in the way of the old blind nuts. Is cutting an access hatch, and gluing in a new 1/4" plywood firewall in behind the original and adding new blind nuts like this: http://www.barnyard-buzzards.com/Bui...ck40/Page2.htm The best way to go? Would just moving my 3.2oz battery way back into the end of the tail work? Or moving the fuel tank just in front of the servos? I did a search but couldn't find any Flubber to use for tank padding.. I already bought 3" foam wheels for the front, but that only saves an oz, and I know it won't be close to enough. I just don't want to add lead to it. It's getting an Irvine .53 up front, so that might add nose weight also. How about a light engine mount that has a big enough "mounting plate" so that I could drill holes into it to match my blind nuts? This is my first ARF, ARF = Almost Ready to Friggin pull your hair out building. Thanks for any ideas. It took me 40 mins of searching to find out how to remove blind nuts, so I did read some before I asked. - Joe